JPS6111196Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention consists of a boom cylinder telescopically inserted into an outer boom whose base end is pivoted to a swivel base, and a wire rope is attached to the upper surface of the main boom. An auxiliary jib for suspending a secondary hook is provided at the tip of the outer boom, and the auxiliary jib is moved between a storage position along the upper surface of the outer boom and a working position where it is pulled out to the front of the tip of the main boom. This invention relates to a work vehicle such as a crane truck equipped with a freely adjustable auxiliary jib.

(Prior Art) As a working vehicle such as a crane truck equipped with the above-mentioned auxiliary jib, the one described in Japanese Utility Model Publication No. 47-37808 is known.

This one has a first pulley placed above the tip boom tube that forms the main boom, and a second pulley placed at the base end of the auxiliary jib, and is pulled forward from a sub winch installed on the swivel platform. The wire rope is formed so that when the auxiliary jib is in the storage position, the wire rope is inverted and folded back from the upper side of the first pulley to the lower side, and then inverted and folded back from the upper side of the second pulley to the lower side,
The auxiliary jib is pulled out to the working position at the same time as the sub winch is driven in the winding direction of the wire rope.

The auxiliary jib is moved from a storage position along the upper surface of the outer boom to a working position where it is pulled out in front of the tip of the main boom by winding and driving the sub winch.

(Problem to be solved by the invention) The above-mentioned auxiliary jib is used to lift a load to a height that is still insufficient even when the main boom is fully extended. The main boom is growing.

When this auxiliary jib is used, the second pulley is located immediately behind the first pulley, and the wire rope is folded back from above the first pulley to the bottom, and then from above the second pulley. It is inverted and folded downward. For this reason, the wire rope is in a so-called S-shaped bending state in which the folding direction is reversed as it passes through the first and second pulleys, and the life of the wire rope during lifting work is significantly shortened. There was a problem.

This idea uses a sub-winch to pull out the auxiliary jib to its working position, and also prevents S-shaped bends in the wire rope when using the auxiliary jib to extend the life of the wire rope. The objective is to obtain a working vehicle such as a crane truck equipped with a new auxiliary jib.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a work vehicle such as a crane truck equipped with the above-mentioned auxiliary jib, wherein a first folding pulley is provided at the tip of the outer boom. A second folding pulley is disposed at the base end of the auxiliary jib, and a wire rope pulled out forward from a sub winch for auxiliary jib work disposed on the swivel table is connected to the auxiliary jib when the auxiliary jib is in the retracted position. After the first folding pulley is inverted from the lower side to the upper side, the second pulley is inverted and folded back from the lower side to the upper side, and the sub winch is driven in the winding direction of the wire rope to pull out the auxiliary jib to provide assistance. When the jib is positioned at the working position and the main boom is extended, the wire rope pulled out from the sub winch is passed sequentially from below the first folding pulley to above the second folding pulley. It is composed of

(Function) With the above configuration, when the sub winch is driven in the winding direction of the wire rope, the auxiliary jib moves on the upper surface of the outer boom and is pulled out in front of the tip of the main boom. Move to position.
Furthermore, when lifting a load using the auxiliary jib in the working position with the main boom extended, the wire rope simply passes under the first pulley and above the second pulley in sequence. These pulleys will not turn around.

(Example) Next, the present invention will be explained in detail based on a specific example.

In FIG. 1, 1 is a traveling base of a working vehicle, and 2 is a swivel base mounted on the traveling base so as to be freely pivotable. 3 is an outer boom whose base end is pivotally supported by the swivel base 2. Reference numeral 4 denotes an intermediate boom tube that is telescopically fitted into the outer boom tube 3; 5 is a tip boom tube that is telescopically inserted into the intermediate boom tube 4; the outer boom tube 3, the intermediate boom tube 4, A main boom A is formed by the tip boom cylinder 5. B is an auxiliary jib installed on the top surface of the main boom A, and the auxiliary jib B is located between the storage position along the top surface of the outer boom 3 and the working position where it is pulled out to the front of the tip of the main boom A. It is movable. 9 is a pulley that is located at the base end of the auxiliary jib B and rolls on the upper surface of the outer boom 3; 10 is a pulley that rolls on the upper surface of the outer boom 3;
A pair of left and right brackets 11, 1 provided at the tip of the
These pulleys and rollers 10 support the movement of the auxiliary jib B. 12
is a sub winch installed on the rotating base 2. The wire rope 13 pulled out from this sub winch 12 is
A first pulley 14 located directly below the roller 10
The second pulley 15 disposed at the base end of the auxiliary jib B is inverted and folded back from the lower side to the upper side, and then the second pulley 15 disposed at the base end of the auxiliary jib B is inverted and folded back from the lower side to the upper side.
It is fastened 16 to the tip of the. Reference numeral 17 denotes a pin that can be inserted and removed freely and fits into a through hole 18 drilled in the bracket 11 and a through hole 19 bored in the auxiliary jib B.
It is impossible to move it forward or backward from the stored position. Then, this pin 17 is inserted into the through holes 18 and 19.
When the sub winch 12 is driven in the winding direction of the wire rope 13, the auxiliary jib B is
The main boom A is pulled out in front of the tip. In the process of pulling out the auxiliary jib B, when the center of gravity of the auxiliary jib B exceeds the roller 10, the auxiliary jib B
The tip side thereof is tilted downward, but this downward tilting is stopped by a roller 20 provided at the tip of the tip boom cylinder 5. When the sub winch 12 is further driven in the winding direction of the wire rope 13 from this state, the stopper 21, which is located at the base end of the auxiliary jib B and protrudes to both sides, is located at the upper part of the tip of the tip boom cylinder 5 and moves rearward. Engaged with the open notch 22, the auxiliary jib B is in the working position. Reference numeral 23 denotes a pin that can be freely inserted and removed to make the auxiliary jib B immovable in this working position, and is inserted into the through hole 2 at the base end of the auxiliary jib B.
4. The through-hole 25 at the tip of the tip boom tube 5 is fitted in a state where they are overlapped. When working using the auxiliary jib B, the main boom A is further extended after the auxiliary jib B is positioned at the working position, and this state is shown in FIG. During this work, the wire rope 13 passes sequentially from the lower side of the first pulley 14 to the upper side of the second pulley 15, and then passes through the auxiliary jib B.
The sub-hanger 27 is placed below the pulley 26 provided at the tip of the
It is something that suspends.

The auxiliary jib B may be stored by raising the main boom A and utilizing the auxiliary jib B's own gravity.

28 is a main winch for controlling the lifting and lowering of the main hanging tool 29 suspended from the tip of the main boom A.

(Effects of the invention) In this invention, the auxiliary jib is pulled out from its storage position to the working position using a sub-winch, so it is easy to pull out the auxiliary jib, and when working using the auxiliary jib, there is no Since the occurrence of bending is prevented as much as possible, the service life of the wire rope can be extended, which is an excellent practical effect.

[Brief explanation of the drawing]

FIG. 1 is an upper side view of a working vehicle showing one embodiment of the present invention, and FIG. 2 is an explanatory diagram of the present invention showing the state of work using an auxiliary jib. 2: Swivel base, 3: Outer boom, A: Main boom,
13: wire rope, 27: sub-hanger, B: auxiliary jib, 14: first pulley, 15: second pulley, 12: sub-winch.

Claims (1)

[Claim for Utility Model Registration] A main boom consisting of an outer boom whose base end is pivotally supported on a swivel table and a boom tube fitted in a telescopic manner, and a sub-hanger attached to the tip of the main boom via a wire rope. A crane equipped with an auxiliary jib for suspending, the auxiliary jib being movable between a storage position along the upper surface of the outer boom and a working position where the auxiliary jib is pulled out to the front of the tip of the main boom. In a work vehicle such as a car, a sub-winch for auxiliary jib work is provided on the swivel platform, and a first pulley is provided at the tip of the outer boom, a second pulley is provided at the base end of the auxiliary jib, and the sub-winch is provided on the swivel base. When the auxiliary jib is in the retracted position, the wire rope pulled forward from the auxiliary jib is formed to be inverted and folded back from the bottom side of the first pulley to the top side, and then inverted and folded back from the bottom side of the second pulley to the top side. When the winch is driven in the winding direction of the wire rope to pull out the auxiliary jib and the auxiliary jib is positioned at the working position, and the main boom is extended, the wire rope pulled out from the sub winch is pulled out from the first pulley. A work vehicle such as a crane truck, which is equipped with an auxiliary jib that passes sequentially from the lower side of the auxiliary jib to the upper side of the second pulley.